Curve-drawing implement.



B. SZILAHD.

CURVE DRAWING HVlPLEMENTA APPLICATION FILED AuGLs. 1913.

hmmm@ Patented Alonzo, 1915 7l-IE NORRIS PETERS C0., PHOTKLLITHO', WASHINGTON. D. c.

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'.BELA SZILARD, OF PARIS, FRANCE.

CURVE-DRAWING IIVIPLEMENT.

l Application led August 6, 1913.

T0 all whom it may concern Beit known that I, BELA SZILARD, Hungarian citizen, resident of Paris, France, have invented a new and useful Curve-Drawing implement, which improvement is fully set forth in the following specification.

The present invention has reference to instruments for tracing curves, for measuring the length of such curves and, consequently, of the surfaces whereon they are indicated, and for constructing curves of which the equation or other data is given.

It relates more particularly to an instrument of the above-specified class or charact-er which is made of some suitable flexible material in order to enable it to take any of the shapes required, and it resides in the provision of improved means whereby the instrument, when bent to such shape, may be ailixed to the paper or other surface to be marked, and thus prevented from beconr ing displaced or distorted.

An embodiment of the invention is illus trated in the accompanying drawing, whereof Figure l is a plan view of one form of the improved implement; Figs. 2 to 5 are plan views of two modifications; and Fig. 6 is an enlarged detail of one of the fastening devices shown in Fig. 5.

The improved implement consists, essentially, of a strip l which may be made of ebonite, wood, ivory, Celluloid, whalebone, horn, or metal, and more particularly of steel, and which possesses sufficient flexibility to render it capable of being bent into any one of the various shapes that might be required.

n order to fasten the strip, when bent, to the paper or other surface and thus retain it in the desired shape, it is provided with a longitudinal series of openings through which pins or tacks may be passed and it may here be stated that the term opening just employed is used in its broadest sense. Thus, in Fig. 1, the openings 1 are in the nature of eyelets which are arranged at intervals along the side edges of the strip, and are located partly on one edge and partly on the other, while in Specification of Letters Patent.

Patented Apr. 20, il9l5.

serial No. 783,336.

Fig. 2, the openings 5 are formed by holes pierced through the strip itself. In Figs. 3 4 and 5, three different types of openings 6, 7 and 8 are depicted, the openings 6 (Fig. 3) being produced by semi-circular bends in a band which is arranged against one edge of the strip, and the openings 7 and 8 (Figs. t and 5, respectively) by holes pierced through lateral tabs secured to the strip edge. The band and the tabs may be either glued, soldered or riveted to the strip, according as they are formed of Celluloid, steel, or German silver, the pins or tacks being inserted through the openings and forced into the paper, as in the other con structions.

One of the tabs 8 is shown in detail in Fig. 6, and this tab, as represented, is bifurcated horizontally, the legs or branches thus produced being formed with the openings through which the fastening device 3 is passed. The said device is preferably in the nature of a push-pin or thumb-tack, as it is variously termed, and its head eX- tends through the hole in the upper leg of the tab and is provided with upper and lower circumferential shoulders or iianges 3 and 3 which are thus disposed upon opposite sides of said leg. The diameters of the said shoulders somewhat exceed that of said hole, and, in consequence, withdrawal of the pin or tack from the tab is prevented, although free play of its head vertically in either direction is permitted. rThe hole in the lower leg of the tab has a diameter which is slightly greater than that of the stem of the pin or tack.

I claim A curve-drawing implement consisting of a strip of flexible material adapted to be bent into the shape of the curve to be drawn and provided along one edge with a series of lateral tabs which are horizontally bifurcated, the legs produced by the bifurcation in each tab being formed with alining openings; in combination with a series of fastening devices for retaining said strip in such shape having their stems inserted through the openings in the lower legs and their heads slidably engaged in the openings 100 in the upper legs, said heads being provided specification in the presence of two subwith spaced upper and lower shoulders dissoribing witnesses.

posed upon opposite side of said upper legs, BELA SZILARD. to prevent vsaid devicesY from being with- Witnesses: 5 drawn from said tabs. EMILE LEDRET,

In testimony whereof I have signed this LUCIEN MEMMINGER.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of- Patents,

Washington, D. C. 

